10-26 Exercise 3: Find roots of a quadratic equation

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Write a program to find roots of a quadratic equation

A quadratic equation is a second order equation having a single variable. Any quadratic equation can be represented as where a, b and c are constants ( a can't be 0) and x is unknown variable. 

寫一個找二次方程的求根程式

For Example

 is a quadratic equation where a, b and c are 2, 5 and 3 respectively.

To calculate the roots of quadratic equation we can use below formula. There are two solutions of a quadratic equation.

使用下列公式:

x = (-b + sqrt(D))/(2*a)
x = (-b - sqrt(D))/(2*a)

where, D = (b*b-4*a*c) is Discriminant (判別式), which differentiate the nature of the roots of quadratic equation.

For the complex result (複數根):

realPart = -b/(2*a);
imaginaryPart =sqrt(-D)/(2*a);

Note: We have used sqrt() function to find square root which is in math.h library.

 

Example input 1:

1 2 1

Example output 1:

Roots of 1.00x^2 + 2.00x + 1.00 = 0 are real and same
x1 = x2 = -1.00

 

Example input 2:

1 -3 2

Example output 2:

Roots of 1.00x^2 + -3.00x + 2.00 = 0 are real and different
x1 = 2.00
x2 = 1.00

 

Example input 3:

1 2 2

Example output 3:

Roots of 1.00x^2 + 2.00x + 2.00 = 0 are complex and different
x1 = -1.00+1.00i
x2 = -1.00-1.00i
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We will continue this question in few days
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Everything is fixed. Enjoy your time with The Judge :)
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ANNNNNNNNNNNNNNNNNNNNNNNNNNGRYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY
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Your code has newline at the end sometime. You learned this lesson many times!
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After i correct the newline in my code,there is still wrong output.However,I had run the program in Codeblocks.The output is still as well as the result. Seeking for help.
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your output lack of 1 space at line 8 when print out "Roots of ...". Please be careful with all small details when working with online judge
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prog.c: In function 'main':
prog.c:9:16: warning: implicit declaration of function 'sqrt' [-Wimplicit-function-declaration]
     x1 = (-b + sqrt(D))/(2*a);
                ^~~~
prog.c:9:16: warning: incompatible implicit declaration of built-in function 'sqrt'
prog.c:9:16: note: include '<math.h>' or provide a declaration of 'sqrt'
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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

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#include<stdlib.h>
#include<math.h>

int main(void)
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prog.c: In function 'main':
prog.c:8:11: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     while(scanf("%lf %lf %lf", &a, &b ,&c)==3)
           ^~~~~
prog.c:8:11: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:8:11: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:18:17: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
                 printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf",a,b,c,x1);
                 ^~~~~~
prog.c:18:17: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:18:17: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:21:17: warning: incompatible implicit declaration of built-in function 'printf'
                 printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and different\nx1 = %.2lf\nx2 = %.2lf",a,b,c,x1,x2);
                 ^~~~~~
prog.c:21:17: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:29:13: warning: incompatible implicit declaration of built-in function 'printf'
             printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf",a,b,c,x1);
             ^~~~~~
prog.c:29:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:34:13: warning: incompatible implicit declaration of built-in function 'printf'
             printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf",a,b,c,x1);
             ^~~~~~
prog.c:34:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:41:13: warning: incompatible implicit declaration of built-in function 'printf'
             printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are complex and different\nx1 = %.2lf+%.2lfi\nx2 = %.2lf%.2lfi",a,b,c,x1,x2,x1,x1);
             ^~~~~~
prog.c:41:13: note: include '<stdio.h>' or provide a declaration of 'printf'
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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
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 ***  * * *   ** ******   *        **  *    *              *  * *       ** ******** ** *** * *      * *  ** *  * *** *** *   of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf\n",a,b,c,x1);
*   * * ** * * * **   ** ***  *****      ****  * * * ******       * 
*  ** *  *  ** * * ** ***   *  * ***  * ***      *      *    **    ***** *  * *  *    * {
* * * * * ** * **   ** **  *   ** *      * * * * * **  *  **  ***    ***    *****  ** ** ** ***   **    *  *** *     ***       of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and different\nx1 = %.2lf\nx2 = %.2lf\n",a,b,c,x1,x2);
 **** * **  ** *    ** *    *    *  ** ** ** **** ***** *  **    **    ** **
* *  ****  **   ***   *****   *      ***** ***     * ***
  **       * * ** ****     *****  **  *      *****  ** if(D==0)
  **    **  **  ** ** * *  * ** *  * *  *** *     * * 
  *  ****  * *  * ***    ******  * * * * *      **  * * ***    *** ***    * **  (-b)/(2*a);
*  * ** *     * * **** *  *** *  **  *** *  *   ******** * **     **  *  *    * * * *
*  * **  **   * *****  *** ***   *    **  *****  **** *    ** *  *** * 
  *** *****    *** **   * *    ** ****   *   *      ***    *** *** *  ** * *** ***  ***** ***** of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf\n",a,b,c,x1);
* * *******   *** ***   * * *  *   * **  ** ****   *  ** ** * **   *** *  *** *   *****  ** 
  * *  * ****      **  ***   ****  ***  *   *    *  **    * ** ** *  **     *** *
**** ****** ***    ***** * ***  *  * ** * ** * ** ** *   *   * * ***     *  **  * ** *  ****
**  *  * *    * ****   *  *    *******  ** ** **** **   *** *    * ******    **   *
**   ***    *  *******  * ****  ** ** **   *     * *   *  *  ** *         * *  ** * ** ** * **  **   * of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf\n",a,b,c,x1);
   *  *  * * * *    ** ** *  ** ** *** ** * ****  * ****  *********   * ** *
**** ***********  *****  *****  **  *   *  *  *  *******  
 ** * *  * ****  ** *  * **     * * ** ** ***** * * *  if(D<0)
** *** **  ** *** *****  * *   ****** * ***** *  ** ***** *    
   *  * *  *   *  *  **** ** *  ** ***  * *   **   **  **     ** * ****** *  * ****   (-b)/(2*a);
  *** * * * *   * *** ** *  *  ***  *   * ***  **       **** **    ****  *** *   -x1;
*    *    * *  **  ** **    *   * **   *    ** *      * * **   *    *  **    *******    ****  ** of %.2lfx^2 + %.2lfx + %.2lf = 0 are complex and different\nx1 = %.2lf+%.2lfi\nx2 = %.2lf%.2lfi",a,b,c,x1,x2,x1,x1);
** * * *  * *** *    *     *  ***** *** **   ***    
 *    **  * *  ***  **** * *
    
  **  *     * ** ****  * * ***   ***    ***  **** * *  *
* *  *      ***** * *  ** ***  0;
}
answered by (-249 points)
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Correct output
Case 3: Wrong output
commented by (4.3k points)
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Hidden content!
  **  ***  ****  *  ***
* *  * ***** ** *** *    
  ***** ** *  ******
int **** * 
* * * * * ***   ** * *   ** a, b, c, D, spD, x1, x2;
*  **  * * * * **  *** *
 **      **  *   **  *   **  **** **    *  %lf *   *** **** * * &b *  ***   
  **     {
  * * ** ** ***** * *     * ****  * **** * * ****  **   * *** - (4*a*c);
*****  **** ******   * * * *** ** *   * * ***     *
 **    **       * ** * *  
 *** ** *       {
* *** * ***  ** *  ** *   **  **   *  * *  * *     ** **    *  **   
  ****** ** **   ** *  *** *   ****  ***   *     *     * **** *  *  **   x1= ** **** 
 ** * **** *  **   ***  **  * * *  *****  *  *   **      * **   x2= ***      
  *    *  *   * ** *** *   ** * * *****   **     *        if (x1==x2){
 *   *      *     ** *****  * *      * * **   *   *    *    *  *        * ** *  * of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 =   * ****   *  * 
 *  *     *  *    * *** *    * * ***   *   *** * **  * * *    **        ***** ** *    **
   * **** **   * ** *   **   * *  *  * **  *** ** **   ****   else {
****       * *** ***   * * **  ***    *******  ** **       * ****   *   ** * *****  **    * * *   * *    of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and  *   ***** = %.2lf\nx2 =   **  **   ***    ****
* *  * **  *** **    *    ***** ** ** ** * *    *  **   **  * *** * * * }
 * * * **  ***    **   *  *     *  ***   *** *** 
* **  *  * ** ****  ****        *  ** ** **     **    *  if(D==0)
  **** * *  * * ** *     {
**  * * ******* *  **** *** ** ** *    * *** * * *  *   ***   ****     ***    *   
 ****     *** *****        *  *   *** **        ***     **   * ** **** * ***  ***  *    * **
* ***  *      * **       {
  *  *   ** ****       **** *  ******   ***** **** ***  **    *   *      *  *****   * ***  * *      *   * *  of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = ****  **  ***    * 
    **  *  * **    **** * **  * *        * * **   ** **    ** ****** *   *
* *  ** ***** **** *     *   *** *** ***      * *            ******* **  *     ** 
** * *  * *   ** * **  ** **    *   ****   *** *     ** *  **** * ** **    *  
****  *           {
  *   *****  * *      *******  ***** *  ** *** ** * **** * **  ** ****** * *  *****  * of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 =     **  **  *   ***
* **** * ** * ** * * **** * ** * *** **    *  * * *   **** ** ** **  **     *   
** *  ******  *** ** * *  *        * *   *  ***** * **   * 
 * ********* ** * *********  ************   * * ** *** * * * **   ***  
**  * **       * *  **   
            x1= ****   
* ****  *        ****    **        * *  x2= -x1;
**     **** * * * * * ******   * *  ***  * *   **    * * *****  * ****   *     * * *   * **  * of %.2lfx^2 + %.2lfx + %.2lf = 0 are complex and     *     * = * * * **  ** =  *  *  ****    *  **** *
***    ***   * **** ***        **   * *  *     ** * ** *
 *   ****  **  ****   *    * ** *
* *** ***  **** * * ***   *
****   * *  *  ** ** **  ***  * * *  * ** * * * * *  *** 
*****    ** ******     * 0;
}
answered by (-249 points)
0 0
/tmp/ccvUqbC2.o: In function `main':
prog.c:(.text+0x6e): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Wrong output
Case 1: Wrong output
Case 2: Correct output
Case 3: Wrong output
commented by (4.3k points)
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Hidden content!
   * *****  **  * ****  
*   *  *   ****** 
int main(){
  *** * ** * * * ****  ** ****   a,b,c;
*** *  **    * *     *  **** D;
 *    *  **  *   * *  **       ****  * %lf * ** ***  *****   * ** **    
* *   ** **     **  * *  * **    ****  - 4*a*c ;

 **  **  *  ****      *****  **  **   * ** of %.2fx^2 + %.2fx + %.2f = 0 * ***** ** **

**  ** *  *  **   ** * *  **********   
* *  *  * *  **   **   **    ***      **     * *       **   *   complex and **   **  **    **
 * * **  ** ** ****** *   *   **   *   *  ** *  *  *  *  ****** *    **  * *** = * * ** *** * * (-b) / (2*a) ), sqrt(-D) / (2*a) );
   **     * *** * * * *    ***   *  * * * ** * *** ** ** ******** * *  =  *  * * *  *   (-b) / (2*a) ), sqrt(-D) / (2*a) );
 * *   * ****** *   **   ** 
       * * * ******* * *** * ** if(D==0){
 * *** * * ** * *  *      **   *****         **  * *** *   *  **      real and same\n");
* *   ***   * ** * ** ***   ***  *    **    *    * ** ***    **** *** = x2 = %.2f",( (-b) / (2*a) ) );
  **  ***** ***** ****  *  *   * 
  *  ** * * ***  ********* *** ***   *
*  ***  ******   ***  *  *   * **   *** *    **** *    *   ** * *  real and *  *   **  * **
** *     * ****** *** ** ***     *    *   *  **    * *   *  * *** = %.2f\n",( ((-b) + sqrt(D)) / (2*a) ) );
  *   ** ** *   * * *   * ****** *******   * **  * **  ** *   *  *  * ***   = %.2f", ( ((-b) - sqrt(D)) / (2*a) ) );
 *  *  *   *   **** *   **** 

  ***    *   ****  **   *  ******  0;
}
answered by (-116 points)
0 0
/tmp/cc8OPUJA.o: In function `main':
prog.c:(.text+0x51): undefined reference to `pow'
prog.c:(.text+0xdd): undefined reference to `sqrt'
prog.c:(.text+0x13f): undefined reference to `sqrt'
prog.c:(.text+0x213): undefined reference to `sqrt'
prog.c:(.text+0x26a): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
/tmp/ccLeUfQ5.o: In function `main':
prog.c:(.text+0x51): undefined reference to `pow'
prog.c:(.text+0xdd): undefined reference to `sqrt'
prog.c:(.text+0x13f): undefined reference to `sqrt'
prog.c:(.text+0x213): undefined reference to `sqrt'
prog.c:(.text+0x26a): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
commented by (4.3k points)
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-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output
commented by (4.3k points)
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Hidden content!
#include  **** **  * ****
#include <math.h>
int main()
{
**  ** * *     ** **    *     a,b,c,x,y,d;
*  **   ***  * *   *    *  *  **   *** * *  ** %f ***  * *** * ** **   *** *****
 *  *   ** *  ** ** *  **   ** *   **  *
   ** * * *    * ** * *  **  ** *     ** **
  ***  ** ** *** ***** *  * **  * *    *
****  * *    *** *     * (d>0){
*  ****  ** *******   **   *  ***  ** of %.2fx^2 + %.2fx + %.2f = 0 are real and    * * ** *  *    *  **
***  * ** ***   **    **  ****  ***  *  = %.2f\nx2 = %.2f",x,y);
* *   ***   * *   **   *
*** *  **** ***       ** *****   if (d==0){
**  ********    *** **  *  ***  ** * of %.2fx^2 + %.2fx + %.2f = 0 are real and * * *     *   
***** *  ***** ** ***    **   **  *   * **  = x2 = %.2f",x);
 **** *** **   ******    ***    
 *    ** **** *   **** **** *   **
** * * ** *      *    ** ***  
  *  *   * *  * * ***** * * *** ***     of %.2fx^2 + %.2fx + %.2f = 0 are complex and *  * * * *** ** * **
 *  ******      *  *** *   **      *   
*  **  **** *** *** *  *   **** *     ** = * *  ** ***  ** ****
  **      ** ****** * ******* * **** * =  * ****** * *   * 
**** * * *  *       **    ** **

 *  **** *     **   * **    * ** 0;
}
answered by (54 points)
1 0
/tmp/ccheVQNV.o: In function `main':
prog.c:(.text+0x87): undefined reference to `sqrt'
prog.c:(.text+0xd5): undefined reference to `sqrt'
prog.c:(.text+0x21f): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
/tmp/ccJPGNPl.o: In function `main':
prog.c:(.text+0x87): undefined reference to `sqrt'
prog.c:(.text+0xd5): undefined reference to `sqrt'
prog.c:(.text+0x21f): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output
commented by (4.3k points)
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